Grinding machine



Dec. 8, 1942.

J. M. LUERS GRINDING MACHINE Filed Feb. 21. 1942 4 Sheets-Sheet 2 INVENTORY 75/? Z0648 Dec. 8, 1942. J. M. LUERS GRINDING MACHINE Filed Feb. 21, 1942 4 Sheets-Sheet '3 INVEN TOR 5 M 40645 Dec. 8, 1942. J, M, LUERS 2,304,580

GRINDING MACHINE Fil ed Feb. 21, 1942 4 Sheets-Sheet 4 INVENTOR If I 7050. Mills r: v

Patented Dec. 8, 1942 STT ES PAT E.

GRINDING mounts .1? ohn M. Luers, Mount Clemens, Mich, assignor to John Milton Luers Patents Incorporated, Detroit, Mich, a corporation of Michigan Application February 21, 1942, Serial No. 431,853

lit Claims.

This invention relates to improvements in grinding machines, and refers particularly to machines for simultaneously grinding two pposed faces of a tool either when these faces are parallel or inclined to one another.

This invention aims, among other things, to provide a grinding machine: wherein the work is reciprocated and two grinding wheels operate upon opposed faces of the work during its movement; wherein two templates are mounted for reciprocation with the work, and each template at all times controls the position of the axis of one of the wheels so that if the actuating or contact face of one of the templates is irregular this identical irregular form is reproduced upon the work by the grinding wheel controlled by that template; wherein means are provided for feeding the grinding wheels towards the work by imparting intermittent movement to the templates at right angles to their path of reciprocation; wherein a wedge-shaped feed member positioned between the templates is employed formoving the latter and imparting this feed; and wherein the grinding wheels are so mounted that they may be angularly adjusted relative to the work to produce positively inclined grain paths upon opposed clearance faces of tools without interfering with the proper movement of the wheels by their templates so that the said wheels continue to impart the required form to the work.

Having thus briefly and broadly stated some of the objects and advantages of the invention, I will now proceed to describe the latter with the aid of the accompanying drawings, in which:

Figure 1 illustrates a plan View of the invention, and

Figure 2 is a front elevation thereof.

Figure 3 is a section on the line 33 of Figure 2.

Figure 4. is a section on the line 5-4 of. Figure 3.

Figures 5 and 6 are sections on the lines 55 and 66 of Figure 4.

Figure '7 is a detailshowing the grinding wheels operating on opposite sides of a cutter head of a tool, the wheels being angularly set relative to the tool to produce grain paths positively inclined to the cutting edge of the tool.

Figure 8 is another detail showingthe grinding wheels and a tool supported between them for grinding along its cutting surface and its opposed bottom face.

Figure 9 is a detail showing irregular templates, and the wedge-shaped feed member between them.

Figure 10 is a partial plan view showing the axes of the grinding wheels inclined relative to the work.

Figure 11 shows a front elevation of amodified stand mounting for the wheel cariwing members, and

Figure 12 is a side view thereof.

Referring to the drawings, l designates a base on which a table 2 is mounted for reciprocation. Mounted on a suitable support 3 is a motor 4 having a crank 5 upon its shaft 6.- Extending from the table 2 is a pin 7 on which one extremity of a connecting rod 8 is mounted, the opposite end of the said rod is mounted upon the crank 5 so that rotation of the motor reoiprocates the table 2 through the crank 5, rod 8 and pin I; obviously, however, other means may be employed for imparting this reciprocating move ment. In the present instance the table is shown hollow int-ermediately of its ends, and mounted upon the base i are spaced rollers 9 (Figures 4 and 5) each of which contacts both sides of the cavity it formed in the table to guide the latter during its movement. Supported upon a bottom plate ll dependingly secured to the table 2 is a wedge-shaped feed member i2 having a guide l3 projecting from one extremity which is axially movable in a bushing I l, and extending from the opposite end of the feed member. i2 is a rod I5 to the outer extremity of which a rack I6 is secured.

Supported for rotation in the table 2 towards the front of. the latter is. a vertical spindle i1 having a ratchet wheel l8 fixed upon its lower extremity and also a gear I9 fixed thereon between the said ratchet wheel and the underside of the said table. The gear I 9 is in mesh with the rack It. The upper extremity of the spindle ll extends through a collar 20 suitably held against rotation and has a flange 2i fixed upon its upper extremity. The collar 20 is provided with suitable. lugs 22 ach of which limits the rotation of the fian-ge 2i and spindle I! in one direction by contacting a finger or stop 23 extending from the said flange.

Formed on one side of the base I is a projection 24 from which a horizontal support 25 ex tends. Mounted for axial movement therea-long is a split mounting 26 including a screw 27 for drawing the split portions together to frictionally engage the support 25 and retain the mounting immovable thereon. Extending also from the projection 24 is a screw 28 in threaded engagement with the mounting 26 through which it projects so that by rotation of this screw 28 the mounting may be moved axially along its support 25 when the screw 21 is loosened. Pivotally supported from the mounting 25 is a-pawl 29 which is normally maintained in its position shown in Figure 6 as by springs 39. The function of the pawl is to engage the ratchet wheel !8 when the table 2 is moving in one direction and turn the spindle ll thereby moving the feed member i2 through the gear. I9 and rack it. Obviously by adjusting the axial position of the mounting 26 upon the support25 the length of movement of the table 2 during which the pawl 29 is in engagement with the ratchet wheel I8 may be varied, and thus the amount of the rotary movement of the ratchet wheel and the movement imparted to the feed member l2 may be regulated. Held against longitudinal movement between downward projections 30 and 3| on opposite ends of the table 2 one on each side of the feed member i2 are templates 32 which rest upon the bottom plate II. The inner faces of these templates are inclined to bear throughout their length against the adjacent sides of the wedge-shaped feed member I2, so that as the latter is moved longitudinally as above described the spacing between the templates is varied.

Pivotally supported on stands 33 are brackets 34' which terminate at their upper extremities in bearings 35. Extending inwardly from each bracket 34 is an arm 36 terminating in a, roller 31 which bears against the outer, control face of the template 32 mounted on the adjacent side of the machine. Supported for both axial and rotary adjustment in each bearing 35 is a guide 38 integral with which is a rest 39 on which, in the present instance, provision is made for supporting a motor 40 as well as a grinding wheel bearing 4|. Supported for rotation in each of the latter is a spindle 42 having a grinding wheel 43 secured thereon. In the present instance a conventional belt drive is provided between each motor 40 and the adjacent spindle 42. It will be noted from Figures 1 and 10 that the center of each grinding wheel 43 is in alignment with the axis of its guide 38 so that the latter may be rotated in its bearing without distortion of the path 'followed by the grinding wheel relative to the contact or control face of the template by which its movement is controlled. While in Figure 6 the contact or control face of the templates are shown straight, they may also be irregular as shown at 320. in Figure 9. Due to the fact that the rests 39, motors and bearings 4| are all located inwardly relative to the pivot mountings of the brackets 34 the weight of these parts retains the rollers 31 in constant contact with the templates 32, though the brackets 34 are frequently very slightly upwardly and inwardly inclined.

In Figures 11 and 12 a modified stand arrangement is shown. In this instance the stand 33a is provided with ways 33b on which a slide 34b formed in the underside of the bracket 34a. is mounted for parallel movement. The entire bracket is then moved horizontally outward by the template adjacent thereto through the arm 35 and suitable means are also provided for retaining the opposed pair of arms 35 in contact with their respective templates. In the instance shown in Figure 11 a spring pressed bar 45 extends between the brackets 34a to retain the arms in contact with their templates.

Any preferred means may be employed for rigidly holding the work A in position for grinding. The means shown consists of arms 53 projecting upwardly from the table 2 and an upper clamping bar 5| secured to and extending between the said arms. A lower clamping member 52 is supported for vertical movement in guides 53 which are connected to a base 54. In threaded engagement with the latter is a screw 55 which, when screwed upwardly, raises the lower clamping bar or member 52 and holds-the work between it and the upper bar 51. Pivotally mounted on the base 54 is a positioning fixture 56 which, when swung upwardly to its limit of movement pins 51 thereon form lateral bearings for one side of the work A so that the latter may be held against the said pins until the screw 55 has been tightened and the work firmly gripped between the bars 5| and 52.

The work A, which consists in the instance shown of a cutting tool, has a wider cutting head B and a narrower shank C which is held between the clamping bars 5| and 52. The axes of the grinding wheels 43 may be turned at any inclination to the work, as clearly shown in Figure 7 to form inclined grain paths upon opposed sides of the cutting head B; and the cutter may also be supported as shown in Figure 8 so that the outer face of the head and the underside of the shank may be simultaneously ground.

From the foregoing it will be clearly seen that I have provided a grinding machine by which two opposed facesof like or dissimilar longitudinal form-may be simultaneously ground while being reciprocated; wherein means including templates are provided for moving the grinding wheels towards and from one another to control the longitudinal form of the ground faces; wherein the grinding wheels are intermittently and automatically fed towards the work; and wherein the r di g wheels may be angularly adjusted relative to the work without distorting the path of the wheels dictated by the templates.

What I claim is:

1. A grinding machine comprising a base, a table mounted thereon for reciprocation, spaced templates each having a contact face thereon mounted on the table for reciprocation therewith, a feed member between the templates carried by the table, for intermittently moving said templates transversely of the table, means operated by the reciprocation of the table for actuating the feed member, brackets mounted for movement adjacent opposite sides of the table, means carried by each bracket coacting with the contact face of one template for moving said brackets, a grinding wheel supported for rotation upon each bracket whereby the position of its axis is controlled by one of the templates, and means for rotating each grinding wheel.

2. A grinding machine comprising a base, a table mounted thereon for reciprocation, means on the table for supporting work, brackets mounted for movement adjacent opposite sides of the table, spaced templates one on each side of the table mounted for reciprocation with the latter, an arm extending from each bracket contacting one template to control the movement of that bracket, a common feed member positioned between the templates and in contact with both the latter, said feed member being moved with said table, means for intermittently moving the feed member on the table actuated by the table movement, a grinding wheel rotatably supported by each bracket, and means for rotating each grinding wheel, said grinding wheels being located towards opposite sides of the table, and the axis of each grinding wheel being adapted to follow a path prescribed by one template.

3. A grinding machine comprising a table mounted for reciprocation upon a base, means for reciprocating the table, a feed member having its opposite sides inclined to the path of movement of the table and carried thereby, a template on each side of the feed member and in contact therewith carried by the table and held against independently longitudinal movement thereon, means for moving the feed member on the table upon reciprocation of the latter to move the templates angularly to the path of movement of the table, a pivoted bracket adjacent each side of the table, an arm projecting from each bracket terminating against one template, a rest carried by each bracket having a grinding wheel rotatably supported thereon, means for rotating each grinding wheel, and the axial position of each grinding Wheel being controlled at all times by one of the templates.

4. A grinding machine comprising a table mounted for reciprocation upon a base, means for reciprocating the table, a feed member having its opposite sides inclined to the path of movement of the table and carried thereby, a template on each side of the feed member and in cont-act therewith carried by the table and held against independent longitudinal movement thereon, means for moving the feed member on the table upon reciprocation of the latter to move the templates angularly to the path of movement of the table, a bracket mounted for rectilinear movement adjacent each side of the table, said movement being at right angles to the table movement, an arm projecting from each bracket terminating against one template, means retaining said arms in contact with their templates, a rest carried by each bracket having a grinding wheel rotatably supported thereon, the axial position of each grinding wheel being controlled at all times by one template, and means for rotating each grinding wheel.

5. A grinding wheel comprising a base, a table mounted thereon for reciprocation, templates held against independent longitudinal movement on the table, a feed member carried by the table for intermittently moving the templates transversely of said table, means operated by the table movement for actuating the feed member, brackets mounted for movement adjacent opposite sides of the table, means carried by each bracket coacting with one template, a rest carried by each bracket, means for rotatably adjusting each rest, a grinding wheel rotatably supported on each rest whereby its axis may be moved angularly to said table by rotary adjustment of the rest, and the center of each grinding Wheel being at all times in alignment with the axis of the rest.

6. A grinding machine including the combination of a base, a table mounted for reciprocation thereon, a wedge-shaped feed member carried on the table for reciprocation therewith, a template bearing against each inclined side of the feed member and held against independent longitudinal movement upon the table, a rack extending from the feed member, a spindle mounted for rotation in the table, a gear on said spindle meshing with the rack, stationary means for rotating the spindle upon each reciprocation of the table to move the rack and feed member and force the templates outwardly, brackets mounted for movement adjacent opposite sides of the table, means carried by the brackets in contact with said templates for controlling the movement of the brackets as the table is reciprocated, and a grinding wheel including means for rotating the same carried by each bracket whereby the path followed by the axis of each grinding wheel is controlled by one of the templates.

7. A grinding machine comprising a base, a table mounted thereon for reciprocation, spaced templates each having a contact face thereon mounted on said table for reciprocation therewith, a feed member between said templates carried by the table for intermittently moving the templates transversely of the table, means operated by the reciprocation of the table for actuating the feed member, brackets mounted for horizontal movement at right angles to the path of movement of the table and adjacent opposite sides thereof, means carried by each bracket coacting with the contact face of one template for moving said brackets, a grinding wheel supported for rotation upon each bracket whereby the position of its axis is controlled by one of the templates, and means for rotating each grinding wheel.

8. A grinding machine comprising a base, a table mounted thereon for reciprocation, spaced templates each having a contact face thereon mounted on the table for reciprocation therewith, a feed member between the templates carried by the table for intermittently moving said templates transversely of the table, means operated by the reciprocation of the table for actuating the feed member, pivoted brackets mounted for movement angularly to the path of movement of the table adjacent opposite sides thereof, means carried by each bracket coacting with the contact face of one template for moving said brackets, a grinding wheel supported for rotation upon each bracket whereby the position of its axis is controlled by one of the templates, and means for rotating each grinding wheel.

9. A grinding machine comprising a base, a table mounted thereon for reciprocation, means on the table for supporting work, brackets mounted for horizontal movement at right angles to the path of movement of the table adjacent opposite sides thereof, spaced templates one on each side of the table mounted for reciprocation with the latter, an arm extending from each bracket contacting one template to control the movement of that bracket, a common feed member positioned between the templates and in contact with both the latter, said feed member being moved with said table, means for intermittently moving the feed member on the table actuated by the table movement, a grinding wheel rotatably supported by each bracket, means for rotating each grinding wheel, said grinding wheels being located toward opposite sides of the table, and the axis of each grinding wheel being adapted to follow a path prescribed by one template.

10. A grinding machine comprising a base, a table mounted thereon for reciprocation, means on the table for supporting work, pivoted brackets mounted for movement angularly to the path of movement of the table and adjacent opposite sides thereof, spaced templates one on each side of the table mounted for reciprocation with the latter, an arm extending from each bracket contacting one template to control the movement of that bracket, a common feed member positioned between the templates and in contact with both the latter, said feed member being moved with said table, means for intermittently moving the feed member on the table actuated by the table movement, a grinding wheel rotatably supported by each bracket, and means for rotating each grinding wheel, said grinding wheels being located toward opposite sides of the table, the axis of each grinding wheel being adapted to follow a path prescribed by one template.

JOHN M. LUERS, 

